Answer:
No asymptote exist or y=0.
Explanation:
Given : Function

To find : The asymptote of the function?
Solution :
We have given the function
is a linear function.
A linear function is in the form
Asymptote is a line that the graph of a function approaches but never touches.
As in the linear function it could have a finite limit as x approaches infinity if the slope is zero then there exist a horizontal asymptote at y = b.
But in the given function

There is no asymptote exist as slope is not zero.
Therefore, There is no asymptote or y=0.